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September Weather in Hollister, United States

Last updated: June 24, 2025

In September, the average temperature in Hollister, United States hovers around 23°C (74°F). However, be prepared for a range, as temperatures can dip to a cool 8°C (47°F) and soar to a warm 35°C (95°F). Expect about 53 mm (2.1 in) of precipitation over roughly 6 days, with an average humidity of 64%, creating a pleasantly warm atmosphere throughout the month.

September Temperature in Hollister

In September in Hollister, the average temperature is 23°C (74°F). Maximum temperatures can reach 35°C (95°F), while the minimum can drop as low as 8°C (47°F). This diverse range of temperatures makes it essential for travelers to pack both light clothing for the warm days and warmer layers for cooler evenings.

September Weather in Hollister: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Hollister, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hollister, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec374051576776807773604843
Data source: Temperature data for Hollister generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Hollister

In Hollister in September, the precipitation amount is 53 mm (2.1 in) over a span of 6 days.

September Precipitation Trends in Hollister

The chart displays monthly precipitation patterns in Hollister, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Hollister, September typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec81941401561728777134531266974
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hollister

In Hollister in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Hollister

This chart illustrates the average monthly humidity levels in Hollister, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Hollister is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hollister

In Hollister in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Hollister.

Maximum UV Index Levels in Hollister for September

The chart shows the monthly maximum UV Index (UVI) for Hollister in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Hollister typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
Data source: Hollister September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Hollister Compares to Other Months

Weather in Hollister varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Hollister, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Hollister, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)80 mm (3.2 inches)81%moderate
February Weather4°C (40°F)94 mm (3.7 inches)78%high
March Weather10°C (51°F)140 mm (5.5 inches)76%very high
April Weather14°C (57°F)156 mm (6.1 inches)78%very high
May Weather20°C (67°F)172 mm (6.8 inches)83%extreme
June Weather24°C (76°F)87 mm (3.4 inches)83%extreme
July Weather26°C (80°F)77 mm (3.0 inches)78%extreme
August Weather25°C (77°F)134 mm (5.3 inches)68%very high
September Weather23°C (74°F)53 mm (2.1 inches)64%very high
October Weather16°C (60°F)126 mm (5.0 inches)70%high
November Weather9°C (48°F)69 mm (2.7 inches)83%moderate
December Weather6°C (43°F)74 mm (2.9 inches)87%moderate

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